JP2644874B2 - Multi-room air conditioner - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a refrigerant cycle of a multi-room air conditioner.

2. Description of the Related Art A conventional refrigerant cycle of a multi-room cooling / heating apparatus in which a heat source side refrigerant cycle and a user side refrigerant cycle are separated and heat exchange is performed by an auxiliary heat exchanger is disclosed in JP-A-62-238954. It looks like Figure 2.

In the figure, 11 is a compressor, 12 is a four-way valve, 13 is a heat source side heat exchanger, 14 is a decompression device for cooling, 15 is a decompression device for heating, 16
Is a check valve for closing the decompression device 14 for cooling during heating, 17 is a check valve for closing the decompression device 15 for cooling during heating, 18 is a first auxiliary heat exchanger, which connects these in a ring shape, Forming a side refrigerant cycle. Reference numeral 19 denotes a second auxiliary heat exchanger which is integrally formed so as to exchange heat with the first auxiliary heat exchanger 18. Reference numeral 20 denotes a refrigerant amount adjustment rank that adjusts the amount of refrigeration during cooling and during heating. Reference numeral 21 denotes a refrigerant transport device having reversible characteristics in which the refrigerant flows in opposite directions during cooling and during heating, and these are housed in the outdoor unit f. Reference numerals 22a and 22b denote user-side heat exchangers housed in the indoor units g and h and connected to the outdoor unit f by connection pipes i, i ', j and j'. The second auxiliary heat exchanger
The use side refrigerant cycle is formed by annularly connecting the 19 with the refrigerant amount adjusting tank 20, the refrigerant transfer device 21, the use side heat exchangers 22a and 22b, and the connection pipes i, i ', j, j'.

The operation of the multi-room air-conditioning apparatus configured as described above will be described.

During the cooling operation, the refrigerant cycle is as indicated by the solid line in the figure.In the heat source-side refrigerant cycle, the high-temperature and high-pressure gas from the compressor 11 passes through the four-way valve 12 and radiates heat in the heat source-side heat exchanger 13 to condense and liquefy. The pressure is reduced by the cooling expansion valve 14, evaporated in the first auxiliary heat exchanger 18, and circulated to the compressor 12 through the four-way valve 12.
At this time, the second auxiliary heat exchanger 19 of the use side refrigerant cycle and the first auxiliary heat exchanger 18 exchange heat, and the gas refrigerant in the use side refrigerant cycle is cooled and liquefied, and passes through the refrigerant amount adjusting tank 20. Is sent to the refrigerant transfer device 21 and is sent to the use side heat exchangers 22a and 22b through the connection pipes i and j by the refrigerant transfer device 21 to absorb heat and evaporate, gasify and connect the connection pipes i ′ and j ′. And circulates to the second auxiliary heat exchanger 19.

On the other hand, during the heating operation, the refrigerant cycle is indicated by a broken line in the drawing, and in the heat source side refrigerant cycle, the high-temperature and high-pressure refrigerant from the compressor 11 is sent from the four-way valve 12 to the first auxiliary heat exchanger 18 where heat is released and condensed. Liquefaction, decompression device for heating from check valve 17
The pressure is reduced at 15, the heat is absorbed and evaporated at the heat source side heat exchanger 13, and the four-way valve 12
And circulates through the compressor 11. At this time, the second auxiliary heat exchanger 19 of the use side refrigerant cycle and the first auxiliary heat exchanger 18 exchange heat, the liquid refrigerant in the use side refrigerant cycle is heated and gasified, and the connection pipes i ′, j ′ Through the connection side i, j to the refrigerant transfer device 21, and circulates from the refrigerant amount adjusting tap 20 to the second auxiliary heat exchanger 19. I do.

However, in the above configuration, when either of the indoor units g and h is a radiant unit, dew condensation occurs on the surface of the radiant panel, and the amount of refrigerant charged in the use-side refrigerant cycle increases, and gas There was a problem that the amount of recharge at the time of leakage increased.

The present invention has been made in view of the above problems, and provides a multi-room air-conditioning apparatus that forms a radiation unit with a simple configuration and that hardly causes dew condensation, and that reduces the amount of refrigerant charged in a use-side refrigerant cycle.

Means for Solving the Problems In order to solve the above-mentioned problems, a multi-room cooling / heating apparatus of the present invention separates a heat source side refrigerant cycle and a use side refrigerant cycle and provides a use side refrigerant provided in parallel with a use side heat exchanger. A third auxiliary heat exchanger that exchanges heat with the cycle, and a radiant refrigerant in which a fourth auxiliary heat exchanger, an auxiliary refrigerant transfer device, and a radiant heat exchanger that are integrally formed with the third auxiliary heat exchanger and that exchange heat are connected in a ring shape It has a cycle.

Operation According to the present invention, a radiation cooling / heating system can be easily realized by the above-described configuration.

Embodiment Hereinafter, a multi-room cooling / heating device according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a refrigerant cycle of a multi-room cooling / heating device according to an embodiment of the present invention.

In the figure, 11 is a compressor, 12 is a four-way valve, 13 is a heat source side heat exchanger, 14 is a decompression device for cooling, 15 is a decompression device for heating, 16
Is a check valve for closing the decompression device 14 for cooling during heating, 17 is a check valve for closing the decompression device 15 for cooling during heating, 18 is a first auxiliary heat exchanger, which connects these in a ring shape, Forming a side refrigerant cycle. Reference numeral 19 denotes a second auxiliary heat exchanger which is integrally formed so as to exchange heat with the first auxiliary heat exchanger 18. Reference numeral 20 denotes a refrigerant amount adjusting tank for adjusting the amount of refrigeration during cooling and during heating. Reference numeral 21 denotes a refrigerant transport device having reversible characteristics in which the refrigerant flows in opposite directions during cooling and during heating, and these are housed in the outdoor unit f. A use side heat exchanger 23 is housed in the main indoor unit 24 and is connected to the outdoor unit f through main connection pipes 25a and 25b.

26 is a third auxiliary heat exchanger communicating with the main connection pipes 25a and 25b, 27 is a fourth auxiliary heat exchanger formed integrally with the third auxiliary heat exchanger and exchanging heat, 28 is an auxiliary refrigerant transfer device, Numeral 29 is a radiant heat exchanger capable of performing radiant cooling and heating, and these are connected to the main connection pipes 25a and 25b through auxiliary connection pipes 30a and 30b.

The second auxiliary heat exchanger 19 and the refrigerant amount adjusting tank 20, the refrigerant transfer device 21, the use side heat exchanger, the third auxiliary heat exchanger, the main connection pipes 25a and 25b, and the auxiliary connection pipes 30a and 30b are connected in a ring shape. Forming a utilization side refrigerant cycle, wherein the fourth auxiliary heat exchanger
27, an auxiliary refrigerant transfer device 28, and a radiant heat exchanger 29 are connected in a ring to form a radiant refrigerant cycle.

The operation of the multi-room air-conditioning apparatus configured as described above will be described.

During the cooling operation, the refrigerant cycle is as indicated by the solid line in the figure.In the heat source-side refrigerant cycle, the high-temperature and high-pressure gas from the compressor 11 passes through the four-way valve 12 and radiates heat in the heat source-side heat exchanger 13 to condense and liquefy. The pressure is reduced by the cooling expansion valve 14, evaporated in the first auxiliary heat exchanger 18, and circulated to the compressor 12 through the four-way valve 12.
At this time, the second auxiliary heat exchanger 19 of the use side refrigerant cycle and the first auxiliary heat exchanger 18 exchange heat, and the gas refrigerant in the use side refrigerant cycle is cooled and liquefied, and passes through the refrigerant amount adjusting tank 20. To the use side heat exchanger 23 through the main connection pipe 25b, and is absorbed and evaporated by the refrigerant transfer apparatus 21, and gasified to pass through the main connection pipe 23a. It will circulate through the exchanger 19. At this time, the third auxiliary heat exchanger 26 of the use-side refrigerant cycle and the fourth auxiliary heat exchanger 27 of the radiant refrigerant cycle exchange heat, are liquefied at a temperature slightly higher than the use-side refrigerant cycle, and are liquefied by the auxiliary refrigerant transfer device 28. The refrigerant is sent to the radiant heat exchanger 29, performs radiant cooling, gasifies, and circulates to the fourth auxiliary heat exchanger.

On the other hand, during the heating operation, the refrigerant cycle is indicated by a broken line in the drawing, and in the heat source side refrigerant cycle, the high-temperature and high-pressure refrigerant from the compressor 11 is sent from the four-way valve 12 to the first auxiliary heat exchanger 18 where heat is released and condensed. Liquefaction, decompression device for heating from check valve 17
The pressure is reduced at 15, the heat is absorbed and evaporated at the heat source side heat exchanger 13, and the four-way valve 12
Through the compressor 11. At this time, the second auxiliary heat exchanger 19 of the use side refrigerant cycle and the first auxiliary heat exchanger 18 exchange heat, and the liquid refrigerant in the use side refrigerant cycle is heated and gasified, and is used through the connection pipe 25a. The refrigerant is sent to the side exchanger 23, heated and liquefied to be radiated, sent to the refrigerant transfer device 21 through the connection pipe 25b, and circulated from the refrigerant amount adjustment tank 20 to the second auxiliary heat exchanger 19.

The gas refrigerant from the refrigerant transfer device 21 also flows to the third auxiliary heat exchanger 26 through the auxiliary connection pipe 33a, exchanges heat with the fourth auxiliary heat exchanger 27, and passes through the auxiliary connection pipe 33b to the main connection pipe. It will be distributed to 25b. At this time, the third auxiliary heat exchanger 26 of the use-side refrigerant cycle and the fourth auxiliary heat exchanger 27 of the radiant refrigerant cycle exchange heat, and the refrigerant sent by the auxiliary refrigerant transfer device 28 has a temperature slightly lower than that of the use-side refrigerant cycle. Then, it is sent to the radiant heat exchanger 29 to be radiated and liquefied, and circulated from the auxiliary refrigerant transfer device 28 to the fourth auxiliary heat exchanger.

As described above, according to the present embodiment, the heat-source-side refrigerant cycle and the use-side refrigerant cycle are separated, and the fourth auxiliary heat exchanger that is formed integrally with the third auxiliary heat exchanger to exchange heat is provided. Equipped with a radiant refrigerant cycle in which radiant heat exchangers are connected in a ring, radiant cooling and heating with a simple structure that does not easily cause dew condensation is possible, the amount of refrigerant charged in the use-side refrigerant cycle is reduced, and the amount of recharge when gas leaks Is reduced.

In the embodiment, one indoor unit and one radiant heat exchanger are used, but it goes without saying that any number of units may be used.

Effect of the Invention As described above, the multi-room air-conditioning apparatus of the present invention separates the heat source-side refrigerant cycle and the use-side refrigerant cycle, is formed integrally with the third auxiliary heat exchanger, and exchanges heat with the fourth auxiliary heat exchanger. Equipped with a radiant refrigerant cycle in which the auxiliary refrigerant transport device and the radiant heat exchanger are connected in a ring, radiant cooling and heating with a simple configuration and less condensation are possible, the amount of refrigerant charged in the used refrigerant cycle is reduced, and gas leakage Has the effect of reducing the amount of recharge.

[Brief description of the drawings]

FIG. 1 is a refrigerant cycle diagram of a multi-room air conditioner in one embodiment of the present invention, and FIG. 2 is a refrigerant cycle diagram of a conventional multi-room air conditioner. 11 Compressor, 13 Heat source side heat exchanger, 18 First auxiliary heat exchanger, 19 Second auxiliary heat exchanger, 21 Refrigerant transfer device, 23 Use side heat exchanger , 24 …… Indoor unit, 26…
... 3rd auxiliary heat exchanger, 27 ... 4th auxiliary heat exchanger, 28 ...
Auxiliary refrigerant transport device, 29: Radiant heat exchanger.

Claims (1)

(57) [Claims] 1. A heat-source-side refrigerant cycle in which a compressor, a four-way valve, a heat-source-side heat exchanger, a pressure reducing device, and a first auxiliary heat exchanger are connected in a ring shape, and a heat source formed integrally with the first auxiliary heat exchanger. A use-side refrigerant cycle in which a second auxiliary heat exchanger to be replaced, a refrigerant transfer device, and a use-side heat exchanger provided in the indoor unit are connected in a ring shape; and a use-side refrigerant cycle provided in parallel with the use-side heat exchanger. A third auxiliary heat exchanger for exchanging heat, and a radiant refrigerant cycle in which a fourth auxiliary heat exchanger, an auxiliary refrigerant transfer device, and a radiant heat exchanger are integrally formed with the third auxiliary heat exchanger and heat exchanged. Multi-room air-conditioning and heating system.